Blasting out Whelen's rapid fire flash patterns, HA239C/HA238 equipped vehicles make other vehicles that use wig-wag lights, look like they are in the dark. CometFlash® and Action FlashTM are the strobe patterns that demands and gets attention in traffic. You get twice the visibility and tracking of any other strobe flashing pattern, plus truer deeper colors. HA239C has tough Santoprene® plastic soft plug in style base that requires no flange mounting holes. Available in clear only. HA238* flange mount style base are available in all our vivid safety colors.